Question map
Which one of the following statements for the work done by gravity on a body is NOT correct ?
Explanation
Gravity is a conservative force, meaning the work done by or against it depends solely on the initial and final positions of the object, not on the specific path taken. The work done by gravity is calculated as the product of the weight and the vertical displacement (h), making it independent of the horizontal distance or the shape of the trajectory. Consequently, if a body is displaced horizontally (perpendicular to the force of gravity), the work done is zero because there is no vertical displacement. Statements 1, 2, and 4 are scientifically accurate descriptions of gravitational work. Statement 3 is incorrect because it claims work depends on the path followed, which contradicts the fundamental property of conservative forces where work is path-independent. In a closed loop, the net work done by gravity is always zero.